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A car battery won’t last forever, even with proper maintenance. If the headlights are dim, the car needs to start outside because the battery is dead, or the battery is more than 3 years old, it’s time to replace the battery. Fortunately, battery replacement is easy and you can do it yourself with just a few basic tools.
Steps
Remove the old battery
- The garage or front entrance is a safe place to change the battery. The place to change the battery needs to be well ventilated (open the garage door).
Tip: Removing the battery will return the clock, radio, locator and alarm to their original settings, so you need to know the alarm’s code before you begin. If you don’t remember, you can refer to the user manual.
- Remove all metal jewelry, such as watches or rings, to avoid electric shock.
- Wear old clothes so you don’t have to worry about getting greasy.
- See the user manual if you can’t find the battery.
- Note that in some vehicles, the battery will be in the rear trunk instead of under the bonnet.
- Secure the negative cable to the engine compartment with a tie wire, making sure it doesn’t come into contact with anything metal.
- Depending on the vehicle, you may need to use a 7-mm, 8-mm, 10-mm, or 13-mm wrench to remove the cable. However, if the battery terminal has a clamp that supports quick opening and closing, you do not need to use a cable remover.
Warning: Make sure the negative and positive cables do not touch each other and do not let them come into contact with anything metal, as this could cause a dangerous short circuit.
- Batteries usually weigh about 10kg, so you should ask someone else to help you if you can’t lift it yourself.
Install a new battery
- Remember that the acid in the battery is corrosive, so do not let it get on your skin or clothing.
- Car batteries come in many sizes and capacities, so you must buy the right one for your vehicle.
- If you live in the US, you should bring your old battery to the store. Some auto parts stores allow you to exchange your old bottle so you don’t have to pay a fee for recyclable parts.
- If the store doesn’t accept the old battery, take it to a recycling center for disposal. Do not throw it in the trash because the battery contains corrosive material.
- Make sure the new battery is installed in the same direction as the old battery.
- You must tighten all the screws on the bracket so that the battery does not shake or move when the car is running.
- Do not spray lithium grease on any other part of the engine other than the positive and negative electrodes.
Warning: When reconnecting a battery, always attach the positive electrode before the negative electrode to avoid accidentally closing the circuit before everything is connected.
- If the battery has a plastic cap, install it.
- Check to make sure all electronics are working properly, then reset the clock, radio, and navigation system.
Advice
- Wear old clothes so you don’t have to worry about getting dirty.
- The battery in some vehicles is mounted in the trunk instead of under the bonnet.
- Some large vehicles have multiple batteries, and are sometimes placed in different locations.
Warning
- Do not place the battery on its side or upside down.
- Avoid working in wet conditions.
- Do not leave metal objects on the battery because the 2 electrodes can connect and cause a short circuit.
- Remove metal jewelry before replacing the battery.
- Wear insulating gloves and safety glasses.
- Never connect 2 battery terminals.
Things you need
- Insulated gloves
- Safety glasses
- Wrench 7-mm, 8-mm, 10-mm, or 13-mm
- Cable ties
- Pipe key
- Extension rod
- Sandpaper or 100-grit . sandpaper
- New battery
- Lithium grease
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 3,048 times.
A car battery won’t last forever, even with proper maintenance. If the headlights are dim, the car needs to start outside because the battery is dead, or the battery is more than 3 years old, it’s time to replace the battery. Fortunately, battery replacement is easy and you can do it yourself with just a few basic tools.
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